When facing against aerial oponents (especially late in the game) upgrade the Megaton hammer (sp?) so that you can make the blast go to wherever you shock, so it acts like a heat seaking missle. That way you don't have to keep zapping your normal lightning ad nauseum, or futiley(sp?) fire your Megaton Hammer, only to miss every time. The precision shock also counts as a normal shock, so if you're trying to do a stunt that requires you to do something, then shock, all in midair, then you can use precission to slow down time and aim for the body. Always heal people (and bioleach if playing evil). The xp adds up, and you won't have to do it later for the trophies. Do all the side quests. If riding the train tracks, and you go on the right side, whenever you see a train coming from the left, that means that the train on the right track (the one you're on) is RIGHT BEHIND YOU!
